In a data distributing party, original data is divided into sub-blocks. The method comprises receiving a change to an object during its development that results in a changed version of the object, identifying information about the change, and creating metadata comprising the information about the change. The base forms a ground plane for the antenna. A door 60 of a cover 50 is opened to carry in a material B1 and carry out a finished product P1. A counter electrode is provided for making electrical connection with the solution and a reference electrode is provided for making electrical connection with the solution with a known electrode potential. The acoustic transducers are detachably mounted in a terminal body.